LXR linux/block/Kconfig

   1#
   2# Block layer core configuration
   3#
   4menuconfig BLOCK
   5       bool "Enable the block layer" if EMBEDDED
   6       default y
   7       help
   8         Provide block layer support for the kernel.
   9
  10         Disable this option to remove the block layer support from the
  11         kernel. This may be useful for embedded devices.
  12
  13         If this option is disabled:
  14
  15           - block device files will become unusable
  16           - some filesystems (such as ext3) will become unavailable.
  17
  18         Also, SCSI character devices and USB storage will be disabled since
  19         they make use of various block layer definitions and facilities.
  20
  21         Say Y here unless you know you really don't want to mount disks and
  22         suchlike.
  23
  24if BLOCK
  25
  26config LBD
  27        bool "Support for large block devices and files"
  28        depends on !64BIT
  29        help
  30          Enable block devices or files of size 2TB and larger.
  31
  32          This option is required to support the full capacity of large
  33          (2TB+) block devices, including RAID, disk, Network Block Device,
  34          Logical Volume Manager (LVM) and loopback.
  35        
  36          This option also enables support for single files larger than
  37          2TB.
  38
  39          The ext4 filesystem requires that this feature be enabled in
  40          order to support filesystems that have the huge_file feature
  41          enabled.    Otherwise, it will refuse to mount any filesystems
  42          that use the huge_file feature, which is enabled by default
  43          by mke2fs.ext4.   The GFS2 filesystem also requires this feature.
  44
  45          If unsure, say N.
  46
  47config BLK_DEV_IO_TRACE
  48        bool "Support for tracing block io actions"
  49        depends on SYSFS
  50        select RELAY
  51        select DEBUG_FS
  52        select TRACEPOINTS
  53        help
  54          Say Y here if you want to be able to trace the block layer actions
  55          on a given queue. Tracing allows you to see any traffic happening
  56          on a block device queue. For more information (and the userspace
  57          support tools needed), fetch the blktrace tools from:
  58
  59          git://git.kernel.dk/blktrace.git
  60
  61          If unsure, say N.
  62
  63config BLK_DEV_BSG
  64        bool "Block layer SG support v4 (EXPERIMENTAL)"
  65        depends on EXPERIMENTAL
  66        ---help---
  67          Saying Y here will enable generic SG (SCSI generic) v4 support
  68          for any block device.
  69
  70          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  71          can handle complicated SCSI commands: tagged variable length cdbs
  72          with bidirectional data transfers and generic request/response
  73          protocols (e.g. Task Management Functions and SMP in Serial
  74          Attached SCSI).
  75
  76          If unsure, say N.
  77
  78config BLK_DEV_INTEGRITY
  79        bool "Block layer data integrity support"
  80        ---help---
  81        Some storage devices allow extra information to be
  82        stored/retrieved to help protect the data.  The block layer
  83        data integrity option provides hooks which can be used by
  84        filesystems to ensure better data integrity.
  85
  86        Say yes here if you have a storage device that provides the
  87        T10/SCSI Data Integrity Field or the T13/ATA External Path
  88        Protection.  If in doubt, say N.
  89
  90endif # BLOCK
  91
  92config BLOCK_COMPAT
  93        bool
  94        depends on BLOCK && COMPAT
  95        default y
  96
  97source block/Kconfig.iosched
  98